Conical steel sleeve dewatering well sealing device on raft

Abstract

The utility model provides a dewatering well sealing device with a tapered steel sleeve on a raft, which comprises a concrete raft, a steel sleeve sealing device, an annular water-stop steel plate and micro-expansion concrete, a plurality of water-stop steel plates are welded on the periphery of the steel sleeve, the steel sleeve sealing device (2) comprises a steel sleeve (21), an annular water-stop steel plate (22) and a tapered plug-in steel barrel (24), and the steel sleeve sealing device (2) is connected with the steel sleeve (21) and the annular water-stop steel plate (22). An upper opening of the steel sleeve is made into a conical horn mouth (23), the shape of the conical insertion steel barrel is matched with that of the horn mouth, and the conical insertion steel barrel is inserted into the horn mouth in a sleeved mode and pressed tightly after being sleeved with an annular water stop belt (4); and a flange (241) of the upper opening of the cone-shaped insertion steel drum is welded with the top of the horn mouth, and the lower side of the cone-shaped insertion steel drum is sleeved with an annular flame-retardant belt (5). And micro-expansion concrete is poured in cavities in the upper part and the lower part of the cone-shaped insertion connection steel barrel. The drainage well sealing device is short in well sealing time and good in well sealing effect, and the leakage phenomenon of a basement raft after the drainage well is sealed is eradicated.

Description

Technical Field

[0001] The utility model relates to a well sealing technology for a foundation pit dewatering well in building construction, in particular to a conical steel casing dewatering well sealing device on a raft plate. Background Art

[0002] In general building construction, water wells are commonly used to dewater the foundation pit, and the wells are sealed when the main structure construction meets the design requirements. The conventional well sealing method is to directly weld a steel cover plate on the top of the dewatering well sleeve after the water level drops after the dewatering well is pumped out, and pour micro-expansion concrete in the steel casing sealing device.

[0003] The Chinese patent document with announcement number CN 206956753 U (patent number CN2017200901327, published on February 2, 2018) discloses a variable diameter well sealing sleeve with a water seal well. The sleeve is provided with two water stop wings in the middle, and the upper part is connected with a variable diameter steel plate, a variable diameter sleeve and a flange in sequence. The flange, rubber pad and cover plate are closed and connected in sequence by bolts; the middle of the well sealing cover plate is connected with a water outlet steel pipe, and a water stop valve is installed on one side of the water outlet steel pipe. The utility model reduces the wellbore diameter of the well sealing sleeve, does not affect the water lowering construction of the submersible pump, is convenient for well sealing construction, and has a short well sealing construction time. The well sealing flange can be installed with water, and normal water lowering can be performed at the same time to ensure that the well sealing flange is installed tightly without leakage. The well sealing can be completed by closing the water stop valve.

[0004] However, the existing dewatering well sealing construction plan has the following main shortcomings: 1. The sealing process is complicated, the technical requirements for component manufacturing are high, the sealing is difficult, and professional personnel are required to operate; 2. Due to the use of well sealing flanges, it is impossible to ensure that the well sealing flanges are tightly installed, which easily leaves leakage risks; 3. Since the steel casing left inside the raft slab is not poured with micro-expansive concrete, the rising groundwater level during well sealing has a relatively large impact on the anti-leakage of the raft slab, especially for dewatering wells with pressurized water heads. The anti-leakage quality of dewatering wells is generally difficult to guarantee. Therefore, leakage is relatively common in dewatering wells after delivery, so it needs to be optimized and improved. Utility Model Content

[0005] The purpose of the utility model is to provide a novel conical steel casing dewatering well sealing device on a raft plate in view of the above problems, so as to solve the main problems existing in the technical background.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is to provide a conical steel casing dewatering well sealing device on a raft, including a concrete raft, a steel casing sealing device, an annular water-stop steel plate, and micro-expansive concrete. The steel casing sealing device is cast together with the foundation concrete raft, and a plurality of water-stop steel plates are welded around the periphery of the steel casing. The plane of the water-stop steel plate is perpendicular to the steel casing and is arranged at a certain interval along its longitudinal direction; micro-expansive concrete is cast in the steel casing sealing device. The steel casing sealing device includes a steel casing, an annular waterstop steel plate and a conical plug-in steel barrel. The upper end of the steel casing is made into a conical-shaped trumpet mouth; the shape of the conical plug-in steel barrel is adapted to the trumpet mouth, and an annular waterstop belt is inserted into the outer side of the steel casing and then inserted into the trumpet mouth and pressed tightly; the upper end of the conical plug-in steel barrel is turned outward to form a flange, and an annular flame-retardant belt is inserted into the lower side of the flange along the four sides of the conical plug-in steel barrel, and the flange of the conical plug-in steel barrel is welded to the top of the trumpet mouth of the steel casing; micro-expansive concrete is poured in the upper cavity of the conical plug-in steel barrel and the lower cavity of the lower steel casing.

[0007] As a further improvement to the above technical solution, the present invention adopts the following technical measures:

[0008] Preferably, the bell mouth at the upper portion of the steel casing is 5 mm to 8 mm lower than the upper surface of the raft.

[0009] Preferably, the distance between the lowest annular water-stopping steel plate and the lower bottom of the concrete raft slab is 200-300 mm.

[0010] The technical solution for sealing a drainage well adopted by the utility model has very prominent substantial advantages: 1. The upper opening of the drainage well sealing steel casing is made into a cone-shaped trumpet mouth, which is convenient for welding with the cone-shaped plug-in steel barrel on its upper part; 2. A cone-shaped plug-in steel barrel is inserted into the trumpet mouth on the upper part of the steel casing, and an annular water stop is inserted between the cone-shaped plug-in steel barrel and the trumpet mouth to form a first waterproof measure; the flange of the cone-shaped plug-in steel barrel is welded to the top of the trumpet mouth of the steel casing to form a second waterproof measure; on the upper part of the cone-shaped plug-in steel barrel, a ring-shaped water stop is inserted between the cone-shaped plug-in steel barrel and the trumpet mouth to form a second waterproof measure. Micro-expansive concrete is poured in the upper cavity and the cavity of the lower steel casing to form the third waterproof measure; this approach greatly increases the anti-leakage ability of the drainage well sealing measures on the raft slab; 3. A conical plug-in steel barrel is inserted into the bell-shaped mouth of the upper part of the steel casing, and an annular waterstop is inserted between the conical plug-in steel barrel and the bell-shaped mouth and pressed, which closes the rising path of groundwater in the drainage well, so that the conical plug-in steel barrel has sufficient time to be welded to the top of the bell-shaped mouth of the steel casing, ensuring the welding quality and enhancing the anti-seepage ability of the drainage well. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0012] Figure 1 It is a cross-sectional view of a main embodiment of the conical steel casing dewatering well sealing device on a raft plate of the utility model.

[0013] In the figure: 1-concrete raft, 2-steel casing sealing device, 21-steel casing, 22-annular water-stop steel plate, 23-trumpet, 24-conical plug-in steel barrel, 241-flange, 3-micro-expansive concrete, 4-annular water-stop belt, 5-annular flame-retardant belt, 6-upper cavity, 7-lower cavity. DETAILED DESCRIPTION

[0014] The structure of the conical steel casing dewatering well sealing device on the raft of the utility model is explained in conjunction with the accompanying drawings.

[0015] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0016] In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model should be understood according to the specific circumstances.

[0017] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0018] like Figure 1As shown, the utility model adopts a conical steel casing dewatering well sealing device on a raft, including a concrete raft 1, a steel casing sealing device 2, an annular water-stopping steel plate 22, and a micro-expansion concrete 3. The steel casing sealing device 2 is cast together with the foundation concrete raft 1, and a plurality of water-stopping steel plates are welded around the steel casing 21. The plane of the water-stopping steel plates is perpendicular to the steel casing 21 and is arranged at a certain interval along its longitudinal direction; the micro-expansion concrete 3 is cast in the steel casing sealing device 2, and the steel casing sealing device 2 includes a steel casing 21, an annular water-stopping steel plate 22 and a conical plug-in steel barrel 24. The steel casing The upper mouth of 21 is made into a cone-shaped bell-mouth 23, and the cone-shaped plug-in steel barrel 24 is inserted into the bell-mouth 23. Its cross-sectional shape is adapted to the bell-mouth 23, and an annular waterstop 4 is inserted between the two. The upper mouth of the cone-shaped plug-in steel barrel 24 is turned outward to form a flange 241, and an annular flame-retardant belt 5 is inserted into the lower side of the flange 241 along the four sides of the cone-shaped plug-in steel barrel 24. The flange 241 of the cone-shaped plug-in steel barrel 24 is welded to the top of the bell-mouth 23 of the steel casing 21; micro-expansive concrete 3 is poured in the upper cavity 6 of the cone-shaped plug-in steel barrel 24 and the lower cavity 7 of the lower steel casing 21.

[0019] like Figure 1 As shown, the bell mouth 23 at the upper part of the steel casing 21 is 5mm-8mm lower than the upper surface of the raft 1 .

[0020] The distance between the bottommost annular water-stopping steel plate 22 and the bottom of the concrete raft slab 1 is 200-300 mm.

[0021] In actual construction, firstly weld several water-stopping steel plates around the periphery of the steel casing 21, make the upper end of the steel casing 21 into a cone-shaped bell mouth 23, and then put the steel casing 21 into the concrete downpipe in the foundation pit. The length of the steel casing 21 must be longer than the thickness of the raft foundation, and cast in the raft concrete. The shape of the cone-shaped plug-in steel barrel 24 inserted above the steel casing 21 is adapted to the bell mouth 23, and after the annular water stop belt 4 is inserted into the outer side, it is inserted into the bell mouth 23 and pressed; the flange 241 of the upper end of the cone-shaped plug-in steel barrel 24 is welded to the top of the bell mouth, and the lower side is inserted into the annular flame retardant belt 5. Micro-expansion concrete 3 is poured on the upper and lower parts of the cone-shaped plug-in steel barrel 24. After the downpipe is closed, check the quality of the well closure. After there is no leakage, add a waterproof additional layer at the well closure position, and then make a waterproof layer together with the entire raft.

[0022] The above description is only an embodiment of the utility model, and does not limit the patent scope of the utility model. According to the content of this specification, many modifications and changes can be made. This specification selects and describes these embodiments in detail in order to better explain the principle and practical application of the utility model, so that technicians in the relevant technical field can understand and use the utility model well. Any equivalent structure or equivalent process transformation made by using the content of the utility model specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the utility model.

Claims

1. A conical steel casing dewatering well sealing device on a raft, comprising a concrete raft, a steel casing sealing device, an annular water-stopping steel plate, and micro-expansion concrete, wherein the steel casing sealing device is cast together with the foundation concrete raft, and a plurality of water-stopping steel plates are welded around the steel casing, the plane of the water-stopping steel plates is perpendicular to the steel casing, and the water-stopping steel plates are arranged at a certain interval along the longitudinal direction thereof; micro-expansion concrete is cast in the steel casing sealing device, characterized in that: The steel casing sealing device (2) comprises a steel casing (21), an annular water-stopping steel plate (22) and a conical plug-in steel barrel (24). The upper end of the steel casing (21) is made into a conical bell mouth (23). The shape of the conical plug-in steel barrel (24) is adapted to the bell mouth (23). After the annular water-stopping belt (4) is inserted into the bell mouth (23) and pressed tightly, the upper end of the conical plug-in steel barrel (24) is made into a conical bell mouth (23). The steel barrel (24) is turned upside down to form a flange (241), and an annular flame retardant belt (5) is inserted into the lower side of the flange (241) along the periphery of the conical plug-in steel barrel (24). The flange (241) of the conical plug-in steel barrel (24) is welded to the top of the bell mouth (23) of the steel casing (21); and micro-expansive concrete (3) is poured into the upper cavity (6) of the conical plug-in steel barrel (24) and the lower cavity (7) of the lower steel casing (21).

2. The conical steel casing drainage well sealing device on the raft according to claim 1 is characterized in that: The bell mouth (23) at the upper portion of the steel casing (21) is 5 mm to 8 mm lower than the upper surface of the raft plate (1).

3. The conical steel casing drainage well sealing device on the raft according to claim 1 is characterized in that: The distance between the lowest annular water-stopping steel plate (22) and the lower bottom of the concrete raft slab (1) is 200-300 mm.

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